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BUG: KMSAN: uninit-value in prefetch_freepointer mm/slub.c:276 [inline]
BUG: KMSAN: uninit-value in slab_alloc_node mm/slub.c:2713 [inline]
BUG: KMSAN: uninit-value in __kmalloc_node+0xef3/0x1240 mm/slub.c:3823
CPU: 0 PID: 4576 Comm: syz-executor7 Not tainted 4.18.0-rc5+ #29
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x185/0x1e0 lib/dump_stack.c:113
 kmsan_report+0x195/0x2c0 mm/kmsan/kmsan.c:982
 __msan_warning+0x7d/0xe0 mm/kmsan/kmsan_instr.c:645
 prefetch_freepointer mm/slub.c:276 [inline]
 slab_alloc_node mm/slub.c:2713 [inline]
 __kmalloc_node+0xef3/0x1240 mm/slub.c:3823
 kmalloc_node include/linux/slab.h:555 [inline]
 kvmalloc_node+0x19d/0x370 mm/util.c:423
 kvmalloc include/linux/mm.h:557 [inline]
 xt_alloc_table_info+0xbe/0x180 net/netfilter/x_tables.c:1186
 do_replace net/ipv6/netfilter/ip6_tables.c:1145 [inline]
 do_ip6t_set_ctl+0x46b/0xa90 net/ipv6/netfilter/ip6_tables.c:1684
 nf_sockopt net/netfilter/nf_sockopt.c:106 [inline]
 nf_setsockopt+0x47c/0x4e0 net/netfilter/nf_sockopt.c:115
 ipv6_setsockopt+0x1e2/0x350 net/ipv6/ipv6_sockglue.c:927
 tcp_setsockopt+0x1c0/0x1f0 net/ipv4/tcp.c:3060
 sock_common_setsockopt+0x13b/0x170 net/core/sock.c:3040
 __sys_setsockopt+0x496/0x540 net/socket.c:1911
 __do_sys_setsockopt net/socket.c:1922 [inline]
 __se_sys_setsockopt net/socket.c:1919 [inline]
 __x64_sys_setsockopt+0x15c/0x1c0 net/socket.c:1919
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x4585ca
Code: 49 89 ca b8 37 00 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 fa 8e fb ff c3 66 0f 1f 84 00 00 00 00 00 49 89 ca b8 36 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 da 8e fb ff c3 66 0f 1f 84 00 00 00 00 00 
RSP: 002b:0000000000a3e328 EFLAGS: 00000206 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 0000000000a3e350 RCX: 00000000004585ca
RDX: 0000000000000040 RSI: 0000000000000029 RDI: 0000000000000013
RBP: 0000000000705d60 R08: 00000000000002e8 R09: 0000000000004000
R10: 0000000000704f80 R11: 0000000000000206 R12: 0000000000000013
R13: 0000000000000000 R14: 0000000000000029 R15: 0000000000704fe0

Uninit was stored to memory at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_save_stack mm/kmsan/kmsan.c:271 [inline]
 kmsan_internal_chain_origin+0x13c/0x240 mm/kmsan/kmsan.c:573
 kmsan_memcpy_origins+0x13d/0x1b0 mm/kmsan/kmsan.c:397
 __msan_memcpy+0xe7/0x150 mm/kmsan/kmsan_instr.c:432
 pskb_expand_head+0x3a6/0x1a70 net/core/skbuff.c:1471
 skb_unclone include/linux/skbuff.h:1443 [inline]
 __tcp_retransmit_skb+0xbd5/0x3f10 net/ipv4/tcp_output.c:2854
 tcp_send_loss_probe+0x81f/0xab0 net/ipv4/tcp_output.c:2508
 tcp_write_timer_handler+0x750/0xf20 net/ipv4/tcp_timer.c:569
 tcp_write_timer+0x12b/0x280 net/ipv4/tcp_timer.c:593
 call_timer_fn+0x296/0x5f0 kernel/time/timer.c:1326
 expire_timers kernel/time/timer.c:1363 [inline]
 __run_timers+0xde6/0x1220 kernel/time/timer.c:1666
 run_timer_softirq+0x43/0x70 kernel/time/timer.c:1692
 __do_softirq+0x55f/0x934 kernel/softirq.c:288

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:256 [inline]
 kmsan_internal_poison_shadow+0xc8/0x1d0 mm/kmsan/kmsan.c:181
 kmsan_kmalloc+0xa1/0x120 mm/kmsan/kmsan_hooks.c:91
 kmsan_slab_alloc+0x10/0x20 mm/kmsan/kmsan_hooks.c:100
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2720 [inline]
 __kmalloc_node_track_caller+0xb48/0x11d0 mm/slub.c:4353
 __kmalloc_reserve net/core/skbuff.c:138 [inline]
 __alloc_skb+0x2cb/0x9e0 net/core/skbuff.c:206
 alloc_skb_fclone include/linux/skbuff.h:1030 [inline]
 sk_stream_alloc_skb+0x17c/0xcf0 net/ipv4/tcp.c:875
 tcp_sendmsg_locked+0x23ca/0x6790 net/ipv4/tcp.c:1290
 tcp_sendmsg+0xb2/0x100 net/ipv4/tcp.c:1447
 inet_sendmsg+0x3fc/0x760 net/ipv4/af_inet.c:798
 sock_sendmsg_nosec net/socket.c:641 [inline]
 sock_sendmsg net/socket.c:651 [inline]
 sock_write_iter+0x408/0x4d0 net/socket.c:920
 call_write_iter include/linux/fs.h:1793 [inline]
 new_sync_write fs/read_write.c:474 [inline]
 __vfs_write+0x87e/0xb90 fs/read_write.c:487
 vfs_write+0x467/0x8c0 fs/read_write.c:549
 ksys_write fs/read_write.c:598 [inline]
 __do_sys_write fs/read_write.c:610 [inline]
 __se_sys_write fs/read_write.c:607 [inline]
 __x64_sys_write+0x1cf/0x400 fs/read_write.c:607
 do_syscall_64+0x15b/0x230 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
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